The Legacy version has been removed from the installer. All CPUs supporting SSE 4.1 are still supported, see a list of those CPUs at https://en.wikipedia.org/wiki/SSE4#Supporting_CPUs

Max 2012 is no longer supported

Developers recommend downloading the material library from the dropbox location, and placing it beside the installer before running the install (though you can run the installer and let it download the material library, if you choose)